7.数据0.0000314用科学记数法表示为( )
0 284628 284636 284642 284646 284652 284654 284658 284664 284666 284672 284678 284682 284684 284688 284694 284696 284702 284706 284708 284712 284714 284718 284720 284722 284723 284724 284726 284727 284728 284730 284732 284736 284738 284742 284744 284748 284754 284756 284762 284766 284768 284772 284778 284784 284786 284792 284796 284798 284804 284808 284814 284822 366461
| A. | 3.14×10-5 | B. | 31.44×10-4 | C. | 3.14×10-6 | D. | 0.314×10-6 |